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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854b615b3db3211b1bdd92846c866fefe22b41cc730add7ca37de7a2317bc1c9' 
  AND token = '3H4tMOfCIVab9tnhkeo4nzEzWmh2QeJPdRdVRgkmL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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