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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c5f508ba71a1e76be1e7bc8688fee370fac001570228a9268d129e9098ed17' 
  AND token = 'cNIhsfauUFa5c5DWEVv26IRb9CrpJXhfNcNV0I/Fs/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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