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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff240092229ebdcd2436408f92b53b17c2df127e30aeeaeec6443394475a110' 
  AND token = 'LWiD7M84tIcT6mcRY64mni1VtDH8dm9t9pUyJpw13eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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