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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98b4b53cdfcc221041f8f0f4e2e099ca7438d2ea5aa71578799c7c83ff161af' 
  AND token = '0E0HZEpZC6VuPUcmvtQzAhd/9oikjg3JVSJ+Tdbu3uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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