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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08851b91f48e375d52430df601a6fcd1cca3baf95c7f8f18eb9a1f39d70f7918' 
  AND token = '7l5xf4K+6dUd3Mn7of+2iLBLJIwxjJtwSN3qvP+tglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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