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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5052475024f2902778bc0d8f30ae54e02956caf8fe86f0b576361094b882cea5' 
  AND token = 'x/ozimjj/4270xFyTUrqyrnVF0NpelRL6wsVH3xH7zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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