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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0818f2b8f5d503f9a9123f737041ded04dd0c6c5b7ea3d9e55d97e6427171e4e' 
  AND token = 'k/p353JGvY98SUKeh9hx6TfPPBU514CCdwqFIJ+IAXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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