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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9d4acd506294f8654b04346f37f1bcbde01b5eba3f4c7c303605d6e861a79d' 
  AND token = 'nx3WlXigDSCMIrrXpIN2tifwlT+Fy6x9dABIXVSNtZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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