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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a2d3f383c7831ed267ef8c1619251aa4a5c32c761a26ee5ba3ddf01591c131' 
  AND token = '3KnhgVfrR3HjncLNE2MJzX1+Wjnxxf2r4z/8wMfo7qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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