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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aeb59914e449ffcdec6a590540f2afd10d685171e7627087589074e8ee880a7' 
  AND token = 'F7g2AdRr4Sv4slB1J/fRIOL+E3VXtAILuCjX16CMsp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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