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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6dbdf5e3d6adddba8582f895238cb78c2e74d14527777bbd8dfc182138f33d' 
  AND token = '1OMGONWDqj7G5pD/pfAXMxlymC95Bf0GLCJhHKTDLUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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