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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7130c3f90e1758246e50ae321a7c2f05ffc8afb5a0e74cec3783f843e1594dad' 
  AND token = 'fKstGo5SnNugfytgH8FDhQ9fWk3CI82Y+qypA82Q+Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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