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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30956b7ee3adf9cf4ea4b9691b6b65816ad0e3ffcbde3b419d49edfa6685a8a7' 
  AND token = 'YwSKfoa0sdAwH3F5tfBxf4nuDeaT9y7GdSuMrNv1RaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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