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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbc8b8786bee59fa491f29eed5e92926023f166704a52a18ff9c0e27e1c44b2' 
  AND token = 'fo8Zh6MyxfFPsIkxfDsHNzrzW3T1uqEU8OVYwr+a1vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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