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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1ddc548376c2995a00d824f57a530d1e0cb6835593913c1dc625912714b891' 
  AND token = 'Mns0YrdgcwfdUzkXVC9pLNv3GyHuUTrdgW1ccwnbmUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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