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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bea10722e2263cdf10f9ef6e6bcbb61aaa93a80f3af82ae21c41890ad62d8d3' 
  AND token = 'fn4pnimSykdxPyKR/01pE852iTgCoP5SUT6RY4H4An0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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