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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994d2c9bb0fd5f3a222aa651a6797612beed16e6f00f9e424263cff4e7e8017c' 
  AND token = 'rlNtEt0QBjd90kmj75593cyRqEZ+XLIptlBrlIXY6IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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