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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19bdbaeac6d2d1e5a1c1b8f4e9b87096f6703a353e0213afb97a4c6f6198517' 
  AND token = 'm14Tro6HPvNB0SBHrVYoulYcbnJRn5AfzsPjObBp4p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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