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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63891553c07e0e6b69dd40e8711bad92ae91147e603602471dec51ad694e7a92' 
  AND token = 'ISog4FNmfFTLX3P2xyjAfbUlbm3YYxoCeiQp9RDRw34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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