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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e27b323c6da25708b14ca45fbef1467136db2d5bac1f791d8a28837b894c41e' 
  AND token = '7J2FD0l0shEmNb4w8dKgZYxsrL8NdQBvdyCLtQ2hZ6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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