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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468319a98c8ec9f224ced60e6444029c3d593e6b614567808af21d6b1993a0e2' 
  AND token = 'xy2w/0oQ59V2DixXvAwcNGvMyXUVs9g1Of6d6xlaaNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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