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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ca477bcf6fd85b08fa034f65779ec8506aed59027466ae92efff65d9fd1ee4' 
  AND token = 'VpGcWVCZ8VI010MimzXtxpR3yqIE/RB0OD2c4aftcOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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