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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66131bdbf021bb47000679d81d764880ea2739d6a7bc5b1753830dcdff4b9a07' 
  AND token = 'MHcQCdknYW7w7xReCT5uYSb1UJ96UNjsJgTCZ7Q69Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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