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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bae7a93b83a1bec057342fd194025188e624065ca5c60b4f3abc74f4c62cf2e' 
  AND token = 'cfm2K2yMoHgKYKWPr9Ro5pA0GMAK56gmTpo6dk7hyMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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