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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9a92473a9545ac03af1c5bccccdcf3f669c2903cbfa6e4b92c3bfa3116617e' 
  AND token = 'TKssyvq+yAF8FJnsfFctcr8+Wri7qsPIqsgE23O0wiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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