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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908e45d11f5ae0b6cad8816b5adde9b81d3c6b46a19493d3de8fb28f6cfd242b' 
  AND token = '32BqGm3oMTaznQcXYKqhNBo0+MLCoadbfRZgVtK1szY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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