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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0620a35aaf7d05ec783426a8239ad9421bb6841394b886a2fd2feb70b43e3cb3' 
  AND token = 'zNZojUmjo1Nfv197E/NbnV2h9Pz4b8lHt9mcOsqFeA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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