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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e802d6f4c4e3eca62e9d57f67fbeaacf638da7413d42035e225d99d361232144' 
  AND token = 'hhOAboRlmIV5PkS9vjMAOaDwOGRH07CXU4yFTo0N9n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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