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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a234fccc786386a6b4dbbd6578aa14138cbd3615c1c12715c6c2b99f33f92085' 
  AND token = 'Nc9JrukhFFsVyqgJFAbPsuwES3M/AB1cI8+N5PXK900=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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