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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614a052817218cc5f9a1d1ef62a84963e3d213d653495d71779ba1f0a5a2e835' 
  AND token = 'gC/qzdRLIEM6s73h954vggO7PsvU7mt/JxxS/OnJt/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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