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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f695491be602f865e6c9a0782ccaaab002df410be51a38dc4dce44a3b6676bd9' 
  AND token = 'tBLsEexCrKmT7Nt69+QAJaSQRWQj0+EZKTOgwiNh1ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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