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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fcf74b6b20de0cd53a373f2a4eee669b8f73beb06e2540e87925d456fb6f79' 
  AND token = '8VUvLJgW88CUOe8OUD64HdGTFEFG0bkMGlAkXcy5ZWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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