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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb80bbdf3fe9c590f3536016bf70c4f8dc19a8de7e0178e4e8b17f884405bb51' 
  AND token = 'yFNTz/wuGGrDayocxikIr2yNEatgybZLDzX4H2TSQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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