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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6faf024809ea9c2446510b0d942c5237dff0ef65b1e203f02f1e4905098c07' 
  AND token = 'xEBvXv1CpEUWIQ7qV+PeEofG1iANtobuNy4BiyLHpaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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