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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05809db55490f2cbe6f5a99d11a62e88adca977b188c01d6c9eece9d5c630501' 
  AND token = 'Qsm9XmDK0EeAs0zfTLNoPLKHdfco0EaqPiWuzsIF0gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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