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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c495d377e2f56ddfe28505b6fe96dcff43d0d782e7ecda44ec47eb8b632ff91' 
  AND token = 'EDKa19I9ZpqEt5bJkX+wC7U9DpVfSDXG03o2V59NfrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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