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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfa06054845f136a529a077ddc3fcafed44b8562f501a6c0c6aa2bd7a969a70' 
  AND token = 'smo8PFUbm0/29Bs8vGKAAasUxLIvJztmEZrbUqwcIZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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