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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a82e6a89202f71667eaa5d9a0beda5495e03a601c37588f3da764154496aa4' 
  AND token = 'U1iCBjPHQBNL56aDKugtjGaV0jpCmP4T8JRBcciEryw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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