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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6d4d7c30647b377f4f16a30ce7bd0d993ecf1066dd924b8dde3d5143579da1' 
  AND token = 'eZx3hTc9EovqORQi0uOfj+yK3BnVf23DE0ExOHAxgr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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