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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13908a92a00c8cb63da32860815e5efca8c92ca30f4276c17cf80748ff9da0b' 
  AND token = 'PdYwMeqkHSLImcksCxiERde+Rt9MpyLY0hVSSNKk7fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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