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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e723a6ba7ea616e7c2ac627e4fcc533bdb4e8201b58f73644f0afa8f9aab964f' 
  AND token = 'gh/DtWni9yTYllf20SCVdVi/sHlMIjDPOglHQnNtHdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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