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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4e8f35a6e45bc2093437da106746fd37ed190bd69667430a66f768eb2cfb4a' 
  AND token = 'Od5tV6SjOvuVE1QSnUZ0gsosmlZNWE9vlGJp3bzNluE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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