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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210c00a49c031528a77fa7b359432ea98cce66b22057f0f6f545b7e3e84da286' 
  AND token = 'mFxD24GRJigf8fcAnrVO1oPLbxEb8CInj6Yc9F/Iyuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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