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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa62000a284ffc9b97e04435ccbb3e3a86bde00664b4b6f3ed59c9785847b746' 
  AND token = '3DTm6bFx/x2zWY5L85kU3uGZshyF1eqDrq77kGDWRPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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