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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39234a8da2bbd7ab4ee3dc8af9c810b6cd4d18f8413cbbc8860f2322ab258f22' 
  AND token = 'KCG2w8EjpPDMVq++K+uPb8fLIyB12MJS4B6SaGkWqJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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