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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0631c091efdd9ca0a2cad7bd7b8fac3b2ee893f9e35474838424aa2a27b3fb21' 
  AND token = '/zTgNP9P1ufyuXNAO3r+0WiKymGcXMaq4dysD2P7fNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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