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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3f3cca853b84eeb51d4f6e093c830898884875c4dcf696a1dc5a34c1090475' 
  AND token = '1krnlX+yl0epgLl+jkhq05MYBOWOfGIZSR7ot3Uyvgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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