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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039836f92ba057590d12f70fd26f2a2785a9ec80aa4dd9048c310b3501340cf2' 
  AND token = 'FoMysUDj9T1CgmXGNWn0fTAxpHmRD1+8abj9wHhzE5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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