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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c50a714b7c6fdc824a7af66c262b63c8140d6198095010020c45a0c50ca51bd' 
  AND token = 'hVJdGz2D8+Yi35ORKj4l+MOa9OkKdU797mRvJJDPmXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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