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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6757c5bc9d657e72fbd2371454c1ce50e2cc46f4fe589f73877564abf3ecbb55' 
  AND token = '/C1OXEGT68dfLvKerCC5049XuHPVVXRY2i7EcNfiVtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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