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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1501dddc002de34c2d35afd9d91de2b501b538889670d38bb5f4dae857a7fe2e' 
  AND token = 'vz/vtOhTF/3cD1Jc64lDBX0Ms0z0LSvzSHgme4hcCGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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