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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6dcec89d32399dff85d4e098c2428797caed638f56f7d96df03f1d2b5634ed' 
  AND token = 'FnGTadNuxPGM9FUh1YvMj140T1jgxkgLXhOA/R0Ic5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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