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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51035151d51cb8f125811eec0582b11156c1d564d00a1d93276e29bd9b3647d2' 
  AND token = 'uyb/usgz9kXxCfTibFJvSNZMLPD4DRn7lWo2P6bbI2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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