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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4117d27be5a242a28bd1c752ce1351793ad70c40acfc909d439dac395429e5b' 
  AND token = 'Ttf8i0Qw5THlqZ0VaKSftKRUGSpIkpqylev8y8N0bwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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