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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d6b74e73dd1c183b39934fa50ebe104b4bbf95f6d4bddc1fb76a1b27680dfc' 
  AND token = 'he/xfDH4NfYOMqUq/5xq+i1loEoDj2it9RqJwSjAKCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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