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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7776d2fe7a1feb5108ceb653d1025e10784ba6f61b0c47f943e22335d0544483' 
  AND token = 'Zm6s20BuHB90sfYeTiNlfVw2OaYG9akKpEykjk9G2UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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