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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e39434649e25acfd3f6a6f3460d5a455a80b0b47ac0e3c15548e44a308ac8e2' 
  AND token = 'ErgadmEBrDE80c7py/xlC+bfJXkYr72An/R9KG0y0VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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