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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67c4e03562c38bad34feb1828e044fab8e5cfcf531fb37b44f30b68c544d990' 
  AND token = 'RW+hhxShfWtmcmQKjoCYWJU2ME4hXQoG93ctqpFai5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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