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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8bbdd96d15dcb8491af9b658b0cb4f77f50a07cfce7b7549b28129be74eea0' 
  AND token = 'vyjNTH1ve/79V8AX5bwHvzZaphj49KWY3v3r2uCPulg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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