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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f6c2aa56b425b0228acbf228ba3506d301eb42dcad5991d9e71c56e9fc1915' 
  AND token = 'QOt/4H8dN6mD4Vmw8mUz9+0F9y1vv+R54x6Mggw+Gb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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