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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b94cb08f5bc64e8803f57d25f5d236255ae151d3e6b14f00acc0b3d90b52b0' 
  AND token = 'YKRVJcy8l4F9VuO7pQSWtkdmyV3Wow0undzAr/d4G78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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