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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a04240eea8706dcccce7a82548d305b9a1aadf2197027dd3bb5a3a6d820fb2' 
  AND token = 'ouwnpXOueLKMclGXVhJl/qorS/Zo8uvAudkIU19YkkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}