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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac81763843545c8c436545f95a4387f5e051ee1f91c34e4ae870cce15bf2d90' 
  AND token = 'NgfqVI7McacXMbGHQcKIRm4S8YNlOnWgyCdRPlC0jEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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